| Treatment | Number of trials (n) | Unweighted event rates of first fractures | RRR (95% CI) | NNT (CI) |
| Calcium or calcium plus vitamin D | 17 (52 625) | 12.12% v 12.74% | 12% (5 to 17) | 63 (37 to 192) |
| Calcium only | 9 (6517) | 15.02% v 16.72% | 10% (0 to 20) | Not significant |
| Calcium plus vitamin D | 8 (46 108) | 11.70% v 12.19% | 13% (3 to 23) | 53 (29 to 500) |
*Abbreviations defined in glossary. Event rates, NNT, and CI provided by author. RRR and CI calculated from data in article.